The present invention relates to a metering system for metering a liquid metering medium, with a suction line, which is filled with a metering medium at the liquid pressure ps, and a pressure line, which is filled with the metering medium at the liquid pressure wherein the suction line is connected to the pressure line by a metering member configured as a metering pump, with which metering medium can be conveyed from the suction line into the pressure line, wherein the metering pump has a conveying chamber, the volume of which can be changed with the aid of a movable displacement element in such a way that, in a first position of the displacement element, the conveying chamber has a minimum volume Vmin and, in a second position of the displacement element, the conveying chamber has a maximum volume Vmax, the conveying chamber being connected by a pressure valve to the pressure line and by a suction valve to the suction line, so, by an oscillating movement of the displacement element, metering medium can alternately be sucked out of the suction line via the suction valve into the conveying chamber and metering medium can be discharged from the conveying chamber via the pressure valve into the pressure line. In order to provide a metering system and a metering pump adapted for this, which has a high degree of efficiency, exhibits no leakage flow and is simply constructed, it is proposed according to the invention that V ma ⁢ ⁢ x V m ⁢ ⁢ i ⁢ ⁢ n > P d P s κ , wherein κ=1.5.